I'm trying to run a jar application under Ubuntu, so I installed OpenJDK Java 7 Runtime, but when I open this application I got this message :

The file '/home/aimad/Programms/jMerise/JMerise.jar' is not marked as
executable. If this was downloaded or copied from an untrusted
source, it may be dangerous to run. For more details, read about the
executable bit.